head gate

Noun
  1. is a type of: regulator - any of various controls or devices for regulating or controlling fluid flow, pressure, temperature, etc.
    is a part of: penstock, sluice, sluiceway - conduit that carries a rapid flow of water controlled by a sluicegate
    same as: floodgate, penstock, sluice valve, sluicegate, water gate
  2. is a type of: gate - a movable barrier in a fence or wall

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